a little off topic
I had a Daisey BB gun in the window rack of my truck when I was in high school one summer. The combination of heat on road vibration caused the barrel to warp and bend downward by about 2" at the end. Granted it was a thin steel barrel with a really thin metal shroud and plastic covering. Had to cut the barrel down to about 1" from the for-end to get it shoot even remotely straight again.